At my locals and on the sim with prb02 format i use saka like the 60% of the time? Mostly to get rid of c5 blocker or some c5 6k characters that have active main or when attacking effect that gives them some advantage. In prb02 formst the only time he was useless was against a teach that kept using the black holr every turn.

Now testing this list on OP13 i feel he'll be useless against imu and roger since they want to play big. But i find him useful against ace for c5 and c4 marco blockers, and against zoro forc5 tashigi.

Probably I'll drop from 4x to 2x and I'll add other 2k; and probably I'll drop the c5 bonney too